Vehicle Speed Sensor: Testing and Inspection

TESTING PROCEDURE:

NOTE: While trouble shooting, always check the wiring, fuses and connectors for good condition and routing. Use the wiring diagrams found in ELECTRICAL DIAGRAMS to supplement your testing efforts.

Fuel Injection, Ignition Control Unit (ECU) And System Relay:

1. Turn ignition OFF.
2. Access fuel injection ECU by removing the passenger side kick panel and glove compartment.
3. Check fuel injection ECU ground connections. They should make good contact and fit tight.

Disconnecting ECU Connector:

4. Remove ECU connector by pressing up the latch and folding out the wire cluster.

Removing Protective Sleeve:

5. Remove connector protective sleeve.
IMPORTANT: ^ Never check connections from the front. Connectors can get damaged and worsen the problem.
^ Check connections through the holes in the connector.
^ Connection pin numbers are printed on the connector side.

Checking Speedometer Signal:

6. Remove panel under instrument panel on driver side.
7. Disconnect 12 terminal connector from speedometer.
8. Connect an ohmmeter between blue (BL) wire and pin 34 of ECU connector.

Reading: 0 ohm

9. If reading is correct and connectors are in good condition, speedometer signal is missing. Fault is not ECU related. Use wiring diagrams (see ELECTRICAL DIAGRAMS) to diagnose the problem.
10. If reading is different, check wiring and connectors. Repair as needed.
11. After testing, disconnect all test equipment, reconnect all connectors (including the ECU connector) and remount all panels.